Oxygen concentrators are machines that take in the air from the surroundings, and concentrates the oxygen from the air. Since air consists of about eighty percent nitrogen and about twenty percent oxygen, O2 concentrators operate by removing the nitrogen from the...

EWOT is an acronym for Exercise With Oxygen Therapy. It was invented by Manfred Von Ardenne, (1907-1997) physicist, researcher and inventor, a state award winner of the USSR, and a national award winner of the GDR. In Germany, Dr. von Ardenne’s homeland, EWOT has...